摘要：From models of galactic evolution, we would expect galaxies as young as these to be relatively low mass, without many stars at all

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请先精读下面句子，翻译，再分析句型结构：

From models of galactic evolution, we would expect galaxies as young as these to be relatively low mass, without many stars at all, and then to grow over time until they became more like our own Milky Way galaxy, which has a mass of about 1.5 trillion solar masses.

核心词汇：

句型及句子成分分析：

这是一个简单句，其复杂之处在于宾语补足语里有时间状语从句及定语从句等。

1. 主句（主谓宾宾补句型）：

We would expect galaxies...to be..., without..., and then to grow...

主语：We

谓语：would expect

宾语：galaxies的 + as young as these（galaxies定语）

宾语补足语：to be... and then to grow...（并列宾语补足语）

2. 时间状语从句（主系表句型）：修饰

从句主语：they

从句系动词：became

从句表语：more like our own Milky Way galaxy

3. 非限制性定语从句（主谓宾句型）：修饰Milky Way galaxy

定语从句主语：which指代our own Milky Way galaxy；

定语从句谓语：has；

定语从句宾语： a mass of about 1.5 trillion solar masses

参考译文：

根据星系演化模型，我们预计像这些一样年轻的星系质量相对较低，几乎没有任何恒星，之后会随着时间的推移逐渐成长，直到它们变得更像我们自己的银河系——后者质量约为1.5万亿太阳质量。

来源：智渊教育